Master thesis considers topology optimization, which is theoretically and then applicably identified. Optimization is rarely represented in Slovenian territory. Regarding this fact, terminology of optimization has been translated to Slovenian language. Furthermore, thesis incorporates identification of the role of optimum design process in product development process and presents theory of numerical optimization focusing on SIMP method. Then, the latter’s algorithm is further used for optimization of two stator plates of an in-wheel electric propulsion motor within Tosca optimization modulus and in Abaqus programming environment. Results of this process are shown in physical products of optimum structure – of two stator plates’ optimum design. It was discovered that, using SIMP as penetration of density of material properties which gives us result in term of variability of the area for achieving optimum design, the algorithm is appropriate for mechanical systems.